singular matrix 3D -the 2D code works but not 3D!
HiI have a situation, I have a 2D code that works fine but when I extend the code to 3D it always has NAN or singualr matrix issue?!?!Its Navier stokes and PNP eqaution plus magnetic field, the problem...
View ArticlePhD candidate
I am trying to define a chiral material with the following constitutive relations: D =ϵE +iξB ,H =μ^(−1)B+iξE to generate OAM, However, I don't know how this material can be defined in COMSOL. While...
View Articletimeavg giving nonsensical values when visualizing results
I'm having difficulty displaying the plot that I want, and I believe part of it might come from a misunderstanding of how the timeavg() operator works. I simulated a time-dependent PDE on the surface...
View ArticleWhich module I should use to design the acoustic metasurface for low frequecy...
Which module I should use to design the acoustic metasurface for low frequecy applications?
View ArticleNow Available - COMSOL Multiphysics® 5.4 – Faster solvers, new modeling...
Hello,I'm pleased to announce that COMSOL Multiphysics® 5.4 is now available. For details, visit: www.comsol.com/release/5.4Release highlights:COMSOL Compiler: For creating standalone executable...
View ArticleHelp with meshing
Hello, I am trying to replicate the results from a paper. I am having problems with the mesh. I have attached a photo with the geometry and a description for the mesh.
View ArticleRelative error exceeding tolerance in periodic structure
Hello,I am building a hexagonal periodic structure excited by an incident plane wave using the Comsol RF module, which I am attempting to simulate through a series of parametric sweeps. Unfortunately,...
View ArticleRunning electro thermal deformation study on a prestressed micromirror
Looking at the prestressed micromirror example I'd like to know how it is possible to run current on the resulting stressed model and observing angle change of the mirror depending on current/heat...
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View ArticleNeed to modify Equation(Transport of Diluted Species)
Hello, I am currently doing a research project and I need to modify an equation. I want the 'R' value on the right hand side to be 0.I have attached a photo with the equation I need to modify.
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Trying to add LASER radiation source to a 3D model
Hello, i have a 3D model of the human eye, i'm trying to add a LASER source and to examine the heating distribution, i added materials for each domain such as absorption and scattering coefficients,...
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Heat transfer equation in PDE Comsol
In the heat transfer equation as attached file, it exits a part: rho x cb x omegab x (T-Tb)However, in Coeffient form PDE equation, only has part aT. Then a = rho x cb x omegab Could you help me to do...
View Articleelectrostatic Force Calculation
Dear Friends, I really need to know how to calculate electrostatic force on the plates of a capacitor. While I am moving the plates closer, the electrostatic force changes but the force on any point...
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Pure imaginary eigen frequncy in high aspect ratio 3D beam
Hello I am lately working with 3D-solid mechanics-Eigen Frequncies. I have problems with simulation when the aspect ratio of the 3D beam is really high. 3D beam is composed of 3 layers gold(0.04 m...
View ArticleSimulation shows this result, why is this?
Some particles have been removed from the simulation due to the maximum number of wall interactions in a time step.
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Implementatation of Neuman boundary conditions
Dear all. I am solving naveir Stokes equations for elliptical shape bubble flow in fluid. I applied my neuman boundary conditions and I got equations in which the the Neuman BC in weak form (equation...
View ArticleOn Simulation of EHD Printing
HI, Question is that :- I want to perform a simulation of EHD printing but do not know how to define the forces namely Fx and Fy. Please suggest me how to deal with it? Also I want to apply a biased...
View ArticleError Due to Singularity
Hi, i am trying to simulate thermal runaway in a cell. During this phenomenon the temperature goes up very quickly like from 400 to 1200 in a single second. Due to this high temperature rise the comsol...
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